bluetooth: Shutdown BluetoothAdapter before DBus on ChromeOS.

device/bluetooth/bluetooth_adapter_factory.cc

Index: device/bluetooth/bluetooth_adapter_factory.cc
diff --git a/device/bluetooth/bluetooth_adapter_factory.cc b/device/bluetooth/bluetooth_adapter_factory.cc
index 33950531312af20a9c055c817a7e4c031c2a37e7..08409c60e816a7106a2b53fb444bd0bb528defed 100644
--- a/device/bluetooth/bluetooth_adapter_factory.cc
+++ b/device/bluetooth/bluetooth_adapter_factory.cc
@@ -95,6 +95,13 @@ void BluetoothAdapterFactory::GetAdapter(const AdapterCallback& callback) {
 }
 
 // static
+void BluetoothAdapterFactory::Shutdown() {
+  if (default_adapter.Get()) {
+    default_adapter.Get()->Shutdown();
+  }
+}
+
+// static
 void BluetoothAdapterFactory::SetAdapterForTesting(
     scoped_refptr<BluetoothAdapter> adapter) {
   default_adapter.Get() = adapter->GetWeakPtrForTesting();